Hypoxia causes vasoconstriction in which of the following vascular beds?

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[Chapter 3, VIII C-F; Table 3.3]. Both the pulmonary and coronary circulations are regulated by $\mathrm{Po}_{2}$. However, the critical difference is that hypoxia causes vasodilation in the coronary circulation and vasoconstriction in the pulmonary circulation. The cerebral and muscle circulations are regulated primarily by local metabolites, and the skin circulation is regulated primarily by sympathetic innervation (for temperature regulation).

Hypoxia Causes Vasoconstriction in Which of the Following Vascular Beds